Q. The face temperatures of a flat wall are 650?C and 450?C respectively and the thermal conductivity of wall material is 0.30 kcal/m-hr-?C. For a wall thickness of 20 cm, the rate of heat conduction per square meter of wall area will be

• (A) 37,500 kg
• (B) 300 kcal/hr
• (C) 600 kcal/hr
• (D) 3000 kcal/hr